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5. A substance with a distinct molecular composition that is produced by or used in a chemical process.
6. The basic structural and functional unit of all living organisms.
7. The amount of matter in an object, typically measured in grams or kilograms.
8. The process of burning something.
9. Related to properties or changes in matter that do not alter its chemical composition.
11. A solid that forms and settles out of a liquid mixture during a chemical reaction.
13. A biological process in which organisms convert oxygen and glucose into energy, releasing carbon dioxide and water.
14. A representation of an object, system, or concept used to explain and predict its behavior.

1. The process by which green plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose and oxygen.
2. A thing or person that is the result of an action or process.
3. A substance that takes part in and undergoes change during a reaction.
4. A pure substance consisting of only one type of atom, defined by its atomic number.
7. A group of two or more atoms chemically bonded together.
10. The smallest unit of an element that retains its chemical properties, consisting of a nucleus surrounded by electrons.
12. A thing or person that is the result of an action or process.